header {
  height: 70px;
  border-bottom: solid 5px #41a8a5;
  box-shadow: rgba(0, 0, 0, 0.9) 0 0 10px;
}
header .container {
  width: 1100px;
  margin: 0 auto;
  font-size: 16px;
  padding-top: 25px;
}
header .container .logo {
  float: left;
}
header .container .logo a {
  color: #0098af;
  font-size: 20px;
  font-weight: bold;
  margin-right: 10px;
  text-decoration: none;
}
header .container nav {
  float: left;
}
header .container nav a {
  text-decoration: none;
  font-size: 18px;
  color: #7c7c8c;
  margin-right: 10px;
}
header .container .message {
  float: left;
  margin-left: 5px;
}
header .container .user {
  float: left;
  margin-left: 10px;
  position: relative;
}
header .container .user:hover {
  cursor: pointer;
}
header .container .user:hover .user-menu {
  display: block;
}
header .container .user .user-menu {
  position: absolute;
  width: 80px;
  border: solid 1px #ececec;
  background-color: white;
  top: 26px;
  display: none;
}
header .container .user .user-menu a {
  text-decoration: none;
  display: block;
  margin-top: 10px;
  color: #999;
  text-align: center;
  font-size: 16px;
}
